Familiarity: I've used it once or twice and have initial impressions
I recently purchased the Castelli Difesa Thermal Cap and took it out on 40-48 degree road ride. The hat did a great job regulating temperature by keeping my head warm but also breathing well. The cap fits great under my helmet and the style matches exactly what I was looking for. The visor is the perfect length and does not interfere with visibility. I give this 4 stars because I really have to pull the ear flaps down to completely cover my ear. I do have a size large head and was worried about the ear coverage when buying this. I am interested to see how this fares in weather below 40 degrees. If you are looking for a hat that gives you a euro feel also protects against the elements, this hat is for you.